Superparamagnetic behaviour of γ-Fe2O3 nanoparticles dispersed in a silica matrix

C. Cannas, G. Concas, D. Gatteschi, Andrea Falqui, A. Musinu, G. Piccaluga*, C. Sangregorio, G. Spano

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

The structural and magnetic properties of two Fe2O3-SiO2 nanocomposites, containing respectively 16.9 and 28.5 wt.% Fe2O3, were investigated. The samples were synthetized by a sol-gel method, using ethylene glycol as a solvent, and heating the gels gradually to 900°C. The procedure allowed us to obtain γ-Fe2O3 nanoparticles homogeneously dispersed in the amorphous silica matrix. The particles have a narrow size distribution and mean sizes from 3 to 6 nm depending on the iron oxide content. The magnetic properties of the samples were investigated by static and dynamic susceptibility measurements. All the samples showed superparamagnetic behaviour. The superparamagnetic relaxation was investigated also by Mössbauer spectroscopy. Hysteresis loops were measured at 2.5 K and both samples showed high values of coercive field. The role of magnetic interparticle interactions on the magnetic properties is discussed.

Original languageEnglish (US)
Pages (from-to)832-838
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume3
Issue number5
DOIs
StatePublished - Mar 15 2001

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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